root/maint/gnulib/tests/minus-zero.h

/* */

INCLUDED FROM

DEFINITIONS

1. compute_minus_zerof
2. compute_minus_zerod
3. compute_minus_zerol

   1 /* Macros for floating-point negative zero.
   2    Copyright (C) 2010-2021 Free Software Foundation, Inc.
   3 
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8 
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13 
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16 
  17 /* Keep in sync with m4/minus-zero.m4!  */
  18 
  19 #include <float.h>
  20 
  21 
  22 /* minus_zerof represents the value -0.0f.  */
  23 
  24 /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
  25    ICC 10.0 has a bug when optimizing the expression -zero.
  26    The expression -FLT_MIN * FLT_MIN does not work when cross-compiling
  27    to PowerPC on Mac OS X 10.5.  */
  28 #if defined __hpux || defined __sgi || defined __ICC
  29 static float
  30 compute_minus_zerof (void)
     /*  */
  31 {
  32   return -FLT_MIN * FLT_MIN;
  33 }
  34 # define minus_zerof compute_minus_zerof ()
  35 #else
  36 float minus_zerof = -0.0f;
  37 #endif
  38 
  39 
  40 /* minus_zerod represents the value -0.0.  */
  41 
  42 /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
  43    ICC 10.0 has a bug when optimizing the expression -zero.
  44    The expression -DBL_MIN * DBL_MIN does not work when cross-compiling
  45    to PowerPC on Mac OS X 10.5.  */
  46 #if defined __hpux || defined __sgi || defined __ICC
  47 static double
  48 compute_minus_zerod (void)
     /*  */
  49 {
  50   return -DBL_MIN * DBL_MIN;
  51 }
  52 # define minus_zerod compute_minus_zerod ()
  53 #else
  54 double minus_zerod = -0.0;
  55 #endif
  56 
  57 
  58 /* minus_zerol represents the value -0.0L.  */
  59 
  60 /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L.
  61    IRIX cc can't put -0.0L into .data, but can compute at runtime.
  62    ICC 10.0 has a bug when optimizing the expression -zero.
  63    The expression -LDBL_MIN * LDBL_MIN does not work when cross-compiling
  64    to PowerPC on Mac OS X 10.5.  */
  65 #if defined __hpux || defined __sgi || defined __ICC
  66 static long double
  67 compute_minus_zerol (void)
     /*  */
  68 {
  69   return -LDBL_MIN * LDBL_MIN;
  70 }
  71 # define minus_zerol compute_minus_zerol ()
  72 #else
  73 long double minus_zerol = -0.0L;
  74 #endif

/* */